Add additional options to Choice, select and checkbox (#18)

- Introduces an option `use_jk_keys` to enable/disable navigating a list using the `j` and `k` keys.
- Introduces an option `show_selected` to hide/show the selected answer.
- Allow a `Choice` to have no shortcut.
- Improve argument validation.

Co-authored-by: Kian Cross <kian@kiancross.co.uk>

questionary/prompts/checkbox.py

@@ -27,6 +27,8 @@ def checkbox(
     pointer: Optional[str] = DEFAULT_SELECTED_POINTER,
     style: Optional[Style] = None,
     initial_choice: Optional[Union[str, Choice, Dict[str, Any]]] = None,
+    use_arrow_keys: bool = True,
+    use_jk_keys: bool = True,
     **kwargs: Any,
 ) -> Question:
     """Ask the user to select from a list of items.
@@ -85,10 +87,21 @@ def checkbox(
         initial_choice: A value corresponding to a selectable item in the choices,
                         to initially set the pointer position to.
 
+        use_arrow_keys: Allow the user to select items from the list using
+                        arrow keys.
+
+        use_jk_keys: Allow the user to select items from the list using
+                     `j` (down) and `k` (up) keys.
+
     Returns:
         :class:`Question`: Question instance, ready to be prompted (using ``.ask()``).
     """
 
+    if not (use_arrow_keys or use_jk_keys):
+        raise ValueError(
+            "Some option to move the selection is required. Arrow keys or j/k keys."
+        )
+
     merged_style = merge_styles(
         [
             DEFAULT_STYLE,
@@ -220,20 +233,24 @@ def all(_event):
 
         perform_validation(get_selected_values())
 
-    @bindings.add(Keys.Down, eager=True)
-    @bindings.add("j", eager=True)
-    def move_cursor_down(_event):
+    def move_cursor_down(event):
         ic.select_next()
         while not ic.is_selection_valid():
             ic.select_next()
 
-    @bindings.add(Keys.Up, eager=True)
-    @bindings.add("k", eager=True)
-    def move_cursor_up(_event):
+    def move_cursor_up(event):
         ic.select_previous()
         while not ic.is_selection_valid():
             ic.select_previous()
 
+    if use_arrow_keys:
+        bindings.add(Keys.Down, eager=True)(move_cursor_down)
+        bindings.add(Keys.Up, eager=True)(move_cursor_up)
+
+    if use_jk_keys:
+        bindings.add("j", eager=True)(move_cursor_down)
+        bindings.add("k", eager=True)(move_cursor_up)
+
     @bindings.add(Keys.ControlM, eager=True)
     def set_answer(event):
 

questionary/prompts/common.py

@@ -69,7 +69,7 @@ def __init__(
         value: Optional[Any] = None,
         disabled: Optional[str] = None,
         checked: Optional[bool] = False,
-        shortcut_key: Optional[str] = None,
+        shortcut_key: Optional[Union[str, bool]] = True,
     ) -> None:
 
         self.disabled = disabled
@@ -84,9 +84,15 @@ def __init__(
             self.value = title
 
         if shortcut_key is not None:
-            self.shortcut_key = str(shortcut_key)
+            if isinstance(shortcut_key, bool):
+                self.auto_shortcut = shortcut_key
+                self.shortcut_key = None
+            else:
+                self.shortcut_key = str(shortcut_key)
+                self.auto_shortcut = False
         else:
             self.shortcut_key = None
+            self.auto_shortcut = True
 
     @staticmethod
     def build(c: Union[str, "Choice", Dict[str, Any]]) -> "Choice":
@@ -114,6 +120,12 @@ def build(c: Union[str, "Choice", Dict[str, Any]]) -> "Choice":
                 c.get("key"),
             )
 
+    def get_shortcut_title(self):
+        if self.shortcut_key is None:
+            return "-) "
+        else:
+            return "{}) ".format(self.shortcut_key)
+
 
 class Separator(Choice):
     """Used to space/separate choices group."""
@@ -192,13 +204,15 @@ def __init__(
         pointer: Optional[str] = DEFAULT_SELECTED_POINTER,
         use_indicator: bool = True,
         use_shortcuts: bool = False,
+        show_selected: bool = False,
         use_arrow_keys: bool = True,
         initial_choice: Optional[Union[str, Choice, Dict[str, Any]]] = None,
         **kwargs: Any,
     ):
 
         self.use_indicator = use_indicator
         self.use_shortcuts = use_shortcuts
+        self.show_selected = show_selected
         self.use_arrow_keys = use_arrow_keys
         self.default = default
         self.pointer = pointer
@@ -263,7 +277,7 @@ def _assign_shortcut_keys(self):
 
         shortcut_idx = 0
         for c in self.choices:
-            if c.shortcut_key is None and not c.disabled:
+            if c.auto_shortcut and not c.disabled:
                 c.shortcut_key = available_shortcuts[shortcut_idx]
                 shortcut_idx += 1
 
@@ -342,10 +356,7 @@ def append(index: int, choice: Choice):
                     )
                 )
             else:
-                if self.use_shortcuts and choice.shortcut_key is not None:
-                    shortcut = "{}) ".format(choice.shortcut_key)
-                else:
-                    shortcut = ""
+                shortcut = choice.get_shortcut_title() if self.use_shortcuts else ""
 
                 if selected:
                     if self.use_indicator:
@@ -381,13 +392,16 @@ def append(index: int, choice: Choice):
         for i, c in enumerate(self.choices):
             append(i, c)
 
-        if self.use_shortcuts:
-            tokens.append(
-                (
-                    "class:text",
-                    "  Answer: {}" "".format(self.get_pointed_at().shortcut_key),
-                )
+        if self.show_selected:
+            current = self.get_pointed_at()
+
+            answer = current.get_shortcut_title() if self.use_shortcuts else ""
+
+            answer += (
+                current.title if isinstance(current.title, str) else current.title[0][1]
             )
+
+            tokens.append(("class:text", "  Answer: {}".format(answer)))
         else:
             tokens.pop()  # Remove last newline.
         return tokens

questionary/prompts/select.py

@@ -28,6 +28,8 @@ def select(
     use_shortcuts: bool = False,
     use_arrow_keys: bool = True,
     use_indicator: bool = False,
+    use_jk_keys: bool = True,
+    show_selected: bool = False,
     instruction: Optional[str] = None,
     **kwargs: Any,
 ) -> Question:
@@ -86,13 +88,35 @@ def select(
 
         use_shortcuts: Allow the user to select items from the list using
                        shortcuts. The shortcuts will be displayed in front of
-                       the list items.
+                       the list items. Arrow keys, j/k keys and shortcuts are
+                       not mutually exclusive.
 
-        use_arrow_keys: Allow usage of arrow keys to select item.
+        use_arrow_keys: Allow the user to select items from the list using
+                        arrow keys. Arrow keys, j/k keys and shortcuts are not
+                        mutually exclusive.
+
+        use_jk_keys: Allow the user to select items from the list using
+                     `j` (down) and `k` (up) keys. Arrow keys, j/k keys and
+                     shortcuts are not mutually exclusive.
+
+        show_selected: Display current selection choice at the bottom of list.
 
     Returns:
         :class:`Question`: Question instance, ready to be prompted (using ``.ask()``).
     """
+    if not (use_arrow_keys or use_shortcuts or use_jk_keys):
+        raise ValueError(
+            "Some option to move the selection is required. Arrow keys, j/k keys or shortcuts."
+        )
+
+    if use_shortcuts and use_jk_keys:
+        if any(getattr(c, "shortcut_key", "") in ["j", "k"] for c in choices):
+            raise ValueError(
+                "A choice is trying to register j/k as a "
+                "shortcut key when they are in use as arrow keys "
+                "disable one or the other."
+            )
+
     if choices is None or len(choices) == 0:
         raise ValueError("A list of choices needs to be provided.")
 
@@ -113,6 +137,7 @@ def select(
         pointer=pointer,
         use_indicator=use_indicator,
         use_shortcuts=use_shortcuts,
+        show_selected=show_selected,
         use_arrow_keys=use_arrow_keys,
         initial_choice=default,
     )
@@ -157,7 +182,13 @@ def _(event):
     if use_shortcuts:
         # add key bindings for choices
         for i, c in enumerate(ic.choices):
-            if isinstance(c, Separator):
+            if c.shortcut_key is None and not c.disabled and not use_arrow_keys:
+                raise RuntimeError(
+                    "{} does not have a shortcut and arrow keys "
+                    "for movement are disabled. "
+                    "This choice is not reachable.".format(c.title)
+                )
+            if isinstance(c, Separator) or c.shortcut_key is None:
                 continue
 
             # noinspection PyShadowingNames
@@ -170,21 +201,23 @@ def select_choice(event):
 
             _reg_binding(i, c.shortcut_key)
 
-    if use_arrow_keys or use_shortcuts is False:
-
-        @bindings.add(Keys.Down, eager=True)
-        @bindings.add("j", eager=True)
-        def move_cursor_down(event):
+    def move_cursor_down(event):
+        ic.select_next()
+        while not ic.is_selection_valid():
             ic.select_next()
-            while not ic.is_selection_valid():
-                ic.select_next()
 
-        @bindings.add(Keys.Up, eager=True)
-        @bindings.add("k", eager=True)
-        def move_cursor_up(event):
+    def move_cursor_up(event):
+        ic.select_previous()
+        while not ic.is_selection_valid():
             ic.select_previous()
-            while not ic.is_selection_valid():
-                ic.select_previous()
+
+    if use_arrow_keys:
+        bindings.add(Keys.Down, eager=True)(move_cursor_down)
+        bindings.add(Keys.Up, eager=True)(move_cursor_up)
+
+    if use_jk_keys:
+        bindings.add("j", eager=True)(move_cursor_down)
+        bindings.add("k", eager=True)(move_cursor_up)
 
     @bindings.add(Keys.ControlM, eager=True)
     def set_answer(event):

tests/prompts/test_checkbox.py

@@ -264,3 +264,17 @@ def test_proper_type_returned():
 
     result, cli = feed_cli_with_input("checkbox", message, text, **kwargs)
     assert result == [1, "foo", [3, "bar"]]
+
+
+def test_fail_on_no_method_to_move_selection():
+    message = "Foo message"
+    kwargs = {
+        "choices": ["foo", Choice("bar", disabled="bad"), "bazz"],
+        "use_shortcuts": False,
+        "use_arrow_keys": False,
+        "use_jk_keys": False,
+    }
+    text = KeyInputs.ENTER + "\r"
+
+    with pytest.raises(ValueError):
+        feed_cli_with_input("checkbox", message, text, **kwargs)

tests/prompts/test_common.py

@@ -7,6 +7,7 @@
 from prompt_toolkit.output import ColorDepth, DummyOutput
 from prompt_toolkit.validation import ValidationError, Validator
 from questionary.prompts import common
+from questionary import Choice
 
 from questionary.prompts.common import (
     InquirerControl,
@@ -128,6 +129,53 @@ def test_prompt_highlight_coexist():
     assert ic._get_choice_tokens() == expected_tokens
 
 
+def test_prompt_show_answer_with_shortcuts():
+    ic = InquirerControl(
+        ["a", Choice("b", shortcut_key=False), "c"],
+        show_selected=True,
+        use_shortcuts=True,
+    )
+
+    expected_tokens = [
+        ("class:pointer", " » "),
+        ("[SetCursorPosition]", ""),
+        ("class:text", "○ "),
+        ("class:highlighted", "1) a"),
+        ("", "\n"),
+        ("class:text", "   "),
+        ("class:text", "○ "),
+        ("class:text", "-) b"),
+        ("", "\n"),
+        ("class:text", "   "),
+        ("class:text", "○ "),
+        ("class:text", "2) c"),
+        ("", "\n"),
+        ("class:text", "  Answer: 1) a"),
+    ]
+    assert ic.pointed_at == 0
+    assert ic._get_choice_tokens() == expected_tokens
+
+    ic.select_next()
+    expected_tokens = [
+        ("class:text", "   "),
+        ("class:text", "○ "),
+        ("class:text", "1) a"),
+        ("", "\n"),
+        ("class:pointer", " » "),
+        ("[SetCursorPosition]", ""),
+        ("class:text", "○ "),
+        ("class:highlighted", "-) b"),
+        ("", "\n"),
+        ("class:text", "   "),
+        ("class:text", "○ "),
+        ("class:text", "2) c"),
+        ("", "\n"),
+        ("class:text", "  Answer: -) b"),
+    ]
+    assert ic.pointed_at == 1
+    assert ic._get_choice_tokens() == expected_tokens
+
+
 def test_print(monkeypatch):
     mock = Mock(return_value=None)
     monkeypatch.setattr(DummyOutput, "write", mock)